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Author:
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ISBN: 9781581450545
Category :
Languages : en
Pages : 14
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Book Description
Author:
Publisher:
ISBN: 9781581450545
Category :
Languages : en
Pages : 14
Get Book Here
Book Description
Author: United States. Ship Structure Committee
Publisher:
ISBN:
Category : Hulls (Naval architecture)
Languages : en
Pages : 40
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Book Description
Author: Ship Structure Committee
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Author:
Publisher:
ISBN:
Category : Naval architecture
Languages : en
Pages :
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Book Description
Author: SHIP STRUCTURE COMMITTEE WASHINGTON D C.
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
The report is arranged in four parts under the general subjects of Design, Fabrication, Materials, and Statistics. Under the first, Design, is recorded confirmation of theoretical formulas for the bending of the hull girder of a ship and demonstration by laboratory tests of the improvements to be gained by relatively simple changes in desgn details. The second part, on Materials summarizes the continuation of the basic work on steel hull plate, looking toward an understanding of the fundamental reasons for brittle fracture, and shows the progress being made toward improvements in specifications in an effort to lower the incidence of fractures. Methods of Fabrication, the third part, summarizes the effect of certain fabrication practices on structural performance. In the fourth part cumulative statistical data on ship casualties are brought up to date.
Author: SHIP STRUCTURE COMMITTEE WASHINGTON D C.
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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To date investigations have not established the relative degree to which residual stress is likely to contribute to the initiation or propagation of fracture in ships. Brittle fracture of mild steel can be obtained when the average tensile stress is smaller than the yield stress, provided there has been some prior compressive cold working of the steel in the direction of the tensile loading. Cleavage-type microcracks are associated with fracture of ship steel at low temperatures. Full-scale heats of semikilled steel can be made in thicknesses to 1 1/2 in. that have about the same notch toughness as ABS Class-B steel in thicknesses to about 1 in. Mill sampling methods have been developed for ABS Class-B and Class-C steel that should be of value to any group that wiches to take samples of these grades of steel. Iridium 192 provides the fastest method and best sensitivity for radiographic inspection of steel welds. A A limited comparison of riveted and welded crack arrestors has verified that for equal materials the riveted arrestor is better (because of the discontinuity of the plating), but that flush-welded strips of high notch-tough steel can stop running cracks under certain laboratory conditions. The required width of material and properties of the arrestor strip have not yet been determined. Flaws cannot yet be evaluated for their potential danger to a structure.
Author: United States. Ship Structure Committee
Publisher:
ISBN:
Category : Marine engineering
Languages : en
Pages : 21
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Author: Ship Structure Committee
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
Author: United States. Ship Structure Committee. Ship Structure Subcommittee
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 80
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Book Description
Author: SHIP STRUCTURE COMMITTEE WASHINGTON D C.
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Justification of the various structural modifications employed is indicated by the service record of Liberty ships and T-2 Tankers, based on reduction of frequency of major casualties. Brittle fractures may be initiated in welded ships if the steel used in the main hull girder absorbs less than 15 ft.-lb. of energy in the standard V-notch Charpy impact test at a temperature of 60 F. It is not known, however, how much more notch-tough the steel must be in order to remove the danger of brittle fracture. This statement is based on the investigation of failures during the past eight years and consequently is established only for the types of vessels covered by the investigation and the operating conditions that existed for these same vessels. Based on the conclusion 3 above, some ship plates in 3/4-in. thickness would appear to be undesirable for use in welded ship construction. Either preheating or postheating generally lowers the transition temperature of ship steel weldments. (Author).
